国外高校老师编写的语音信号特征提取程序，非常实用初学者研究- [E, V, A, P] = analysis(x, N, U, M) extracts vocoder parameters E, V, A, and P from the speech signal x on a fr a me by fr a me basis. N is the analysis fr a me length, U is the update length, and M is the order of